Wye-Wye to 100kW Xantrex blows utility meter fuse [RE-wrenche s] [RE-wrench

[Roy Dyngen]

Hello Mark,

After some research I believe that your fuse does in fact need to be at
least 175 amp.  If I use 110kw/480vac *.707, (correct me if I'm wrong), I
get about 161 amps per phase.  This may require upsizing the conductor as
well.

Roy Dyngen

-----Original Message-----
From: Mark Robinson [mailto:Mark at TheEnergyGrid.com] 
Sent: Tuesday, September 02, 2003 8:30 AM
To: RE-wrenches at topica.com
Subject: Wye-Wye to 100kW Xantrex blows utility meter fuse [RE-wrenches]


Just finished installing a 124kw system in El Cajon. (very sweet.. see
photos at www.Nextekpower.com) 4kW is connected to the Nextek DC lighting
system... that part works great. 120k is connected to a 100k PV-100208
Xantrex. We're blowing the AC fuse on the C leg at the utility meter and we
think it may have to do with the isolation transformer. If you've had any
experience with this, please let me know.

Here are the Details:
SDGE comes in with 480/277 3 phase Wye transformer.
Ideally, It would make sense to use a Wye Delta Isolation transformer to the
Xantrex but, because of costs (and with the blessings of Xantrex) we used a
Wye-Wye with and X0 not connected (floating). At the Utility meter, and
all-in-1 test section with pullout fuses, the three phases are protected
with JLLS 150 AMp Fuses. The C Phase keeps blowing and the #2 wires are hot.
No Unusual THD reading although there is 6A on the neutral, which Xantrex
says is normal (??) in a system this size. Xantrex says we should remove the
connection to H0 at the transformer and replace the fuse with a 175 AMP...
suitable for the wire but not ideal according to the 125% rule.

Thoughts?

Mark Robinson
The Energy Grid


VP Sales and Marketing

Nextek Power Systems, Inc.

89 Cabot Court, Suite L

Hauppauge, NY 11788

(603) 305-1942

www.NextekPower.com

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